You may reveal a white card from among them and put it into your hand
"Our world has not felt her thundering steps in lifetimes
up to two target creatures each get +2/+2 and gain trample until the end of turn
That creature deals damage equal to its power to its controller
{3}: Destroy Wall of Vipers and target creature it's blocking
Trading Post [Commander 2014] OP06-077 You may reveal a whiteSet: Commander 2014 Type: Artifact Rarity: Rare Cost: {4} {1}, {T}, Discard a card: You gain 4 life. {1}, {T}, Pay 1 life: Create a 0 1 white Goat creature token. {1}, {T}, Sacrifice a creature: Return target artifact card from your graveyard to your hand. {1}, {T}, Sacrifice an artifact: Draw a card.